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Displaying records 91 to 100 of 829 records.
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91. Precise conductance measurements of a pinhole orifice using a constant-pressure flowmeter
Topic: Chemistry
Published: 12/1/2012
Authors: James A Fedchak, Dana R Defibaugh
Abstract: A pinhole orifice with a known conductance can be used as the basis of a flowmeter. Commercially available laser-drilled pinhole orifices with diameters ranging from 1.0 μm to 50 μm can have conductances ranging from about 0.1 μL/s to ...

92. A Humidity Generator for Temperatures to 200 °C and Pressures to 1.6 MPa
Topic: Chemistry
Published: 11/30/2012
Authors: D Vega-Maza, W Wyatt Miller, Dean C Ripple, Gregory E Scace
Abstract: We have constructed a new humidity generator that produces gas streams of known moisture content at temperatures from 85 °C to 200 °C, absolute pressures from 0.2 MPa to 1.6 MPa, and relative humidities from 10 % to 90 %. The generator produces a moi ...

93. Absolute line intensities for ethylene from 1800 to 2350 cm-1.
Topic: Chemistry
Published: 11/17/2012
Authors: Walter Joseph Lafferty, Jean-Marie Flaud, A. Ben Hassen, F. Kwabia Kwabia Tchana, X Landsheere, H Aroui
Abstract: Fourteen Fourier transform spectra of ethylene (C2H4) have been recorded in the 1800-2350 spectral domain with different path-lengths and pressures and used to derive individual line intensities for lines belonging to the ν7 + ν8, ν4 ...

94. Temperature Dependence of Electron Magnetic Resonance Spectra of Iron Oxide Nanoparticles Mineralized in Listeria Innocua Protein Cages
Topic: Chemistry
Published: 10/16/2012
Author: Robert J. Usselman
Abstract: Electron magnetic resonance (EMR) spectroscopy was used to determine the magnetic properties of maghemite (gamma-F^de^2O^d3^) nanoparticles formed within size-constraining {I}Listeria innocua{/I} Dps protein cages that have an inner diameter of 5 nm. ...

95. Modeling Chloride transport in Cracked Concrete: A 3-D image-based microstructure simulation
Topic: Chemistry
Published: 10/3/2012
Authors: Edward Joseph Garboczi, Dale P Bentz, Jeffrey M. Davis, Yang Lu
Abstract: The prediction of the service life of concrete materials is difficult, mainly because of their complex heterogeneous microstructure and their random nature. Studying the presence of cracks in concrete and their effect on chloride transport and reacti ...

96. Biosynthesis of Athmu, a alpha,gamma-hydroxy-ß-amino acid of pahayokolides A-B
Topic: Chemistry
Published: 10/2/2012
Authors: Li Liu, Daniel W Bearden, Juan C. Rodriguez, Kathleen S. Rein
Abstract: Pahayokolides A-B are cyanobacteria derived non-ribosomal peptides which exhibit cytotoxicity against a number of cancer cell lines. The biosynthetic origin of the 3-amino-2,5,7,8- tetrahydroxy-10-methylundecanoic acid (Athmu) moiety has been inv ...

97. A 4:1 transmission-line impedance transformer for broadband superconducting circuits
Topic: Chemistry
Published: 10/1/2012
Authors: Leonardo M. Ranzani, Lafe F. Spietz, Jose Alberto Aumentado, Zoya Popovic
Abstract: We present a 4 : 1 superconducting transmission-line impedance transformer for cryogenic applications. The device transforms 25 {Omega} in the coplanar waveguide to 6.25 {Omega} in the microstrip and is designed to operate at 20 mK. Calibrated me ...

98. Guidelines for Access Control System Evaluation Metrics
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 7874
Topic: Chemistry
Published: 9/14/2012
Authors: Chung Tong Hu, Karen Scarfone
Abstract: The purpose of this document is to provide Federal agencies with background information on access control (AC) properties, and to help access control experts improve their evaluation of the highest security AC systems. This document discusses the ...

99. Measurement of Scattering Cross Section with a Spectrophotometer with an Integrating Sphere Detector
Series: Journal of Research (NIST JRES)
Report Number: 117.012
Topic: Chemistry
Published: 9/13/2012
Authors: Lili Wang, Steven J Choquette, Yu-Zhong Zhang, Victoria Karpiak, Adolfas Kastytis Gaigalas
Abstract: A commercial spectrometer with an integrating sphere (IS) detector was used to measure the scattering cross section of microspheres. Analysis of the measurement process showed that two measurements of the extinction, one with the cuvette placed i ...

100. Recommended vapor pressure and thermophysical data for ferrocene
Topic: Chemistry
Published: 8/14/2012
Authors: Michal Fulem, Kvetoslav Ruzicka, Marisa A.A. Rocha, Luis M.N.B.F. Santos, Robert F Berg
Abstract: Recommended vapor pressure data for ferrocene (CAS Registry Number: 102-54-5) in the temperature range from 242 to 447 K were developed by the simultaneous correlation of critically assessed vapor pressures, heat capacities of the crystalline phase a ...

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